Well, I'm far from being a farmer. I'm just a guy trying to give you the benefit of my experience in using E10 for thirty years or so in a wide variety of old and new road vehicles and OPEs.
I can tell you based upon decades of actual experience that the downside of using E10 is nothing, but you don't seem to want to hear that. There is no observable loss in fuel economy that we saw during the transitional period and there are no fuel system or carburetor problems either. The OPE shops often use E10 as the scapegoat for the bad results of the last half-baked carburetor "rebuild" they did, but seldom used OPEs stored wet have always had problems and have always been gravy to small engine shops.
If you post here, you should expect those of us with actual experience to relate that to you, rather than the nonsense delivered in stentorian prose that some other posters in this thread have offered. In short, if you want advice based upon real experience, there are those here who can deliver it.
If that isn't what you want to hear, then you could simply save everyone's time and not start a thread.